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Which one of the following ions exhibits d-d transition and paramagnetism as well?
medium
The d and f Block Elements
2018
chemistry
Cr 2 _2 2 ā O 7 2 ā _7^{2-} 7 2 ā ā
M n O 4 2 + Mn{O}_4^{2+} M n O 4 2 + ā
Explanation To solve this problem, we need to identify the ion that exhibits both d-d transition and paramagnetism.
\newline Let's analyze each option:
\newline ā¢ Option 1: M n O 4 ā MnO_4^-
\newline M n O 4 ā ā - In M n O 4 ā , MnO_4^-, M n O 4 ā ā ,
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manganese is in the +7 oxidation state.
- The electronic configuration of Mn in this state is
[ A r ] 3 d 0 . [Ar] 3d^0.
\newline [ A r ] 3 d 0 . - Since there are no d-electrons, d-d transitions are not possible, and it is diamagnetic.
ā¢ Option 2:
C r 2 O 7 2 ā Cr_2O_7^{2-}
\newline C r 2 ā O 7 2 ā ā - In
C r 2 O 7 2 ā , Cr_2O_7^{2-}, C r 2 ā O 7 2 ā ā , chromium is in the +6 oxidation state.
- The electronic configuration of Cr in this state is
[ A r ] 3 d 0 . [Ar] 3d^0.
\newline [ A r ] 3 d 0 . - Similar to MnO_4^-, there are no d-electrons, so no d-d transitions, and it is diamagnetic.
ā¢ Option 3:
C r O 4 2 ā CrO_4^{2-}
\newline C r O 4 2 ā ā - In
C r O 4 2 ā , CrO_4^{2-}, C r O 4 2 ā ā , chromium is also in the +6 oxidation state.
- The electronic configuration is
[ A r ] 3 d 0 , [Ar] 3d^0, [ A r ] 3 d 0 , so no d-d transitions, and it is diamagnetic.
ā¢ Option 4:
M n O 4 2 + MnO_4^{2+}
\newline M n O 4 2 + ā - In
M n O 4 2 + , MnO_4^{2+}, M n O 4 2 + ā , manganese is in the +6 oxidation state.
- The electronic configuration of Mn in this state is
[ A r ] 3 d 1 . [Ar] 3d^1.
\newline [ A r ] 3 d 1 . - With one d-electron, d-d transitions are possible, and it is paramagnetic due to the unpaired electron.
Therefore, the correct option is Option 4, as
M n O 4 2 + MnO_4^{2+} M n O 4 2 + ā exhibits both d-d transition and paramagnetism.